基本物理学理论上，空气越稀薄情况下，任何物体的耐性都会减少，因此球路也会因海拔高度不同而有所变化。

It's the basic physics that the air is thinner and the resistance to any projectile is less so the flight path of the ball will be different at high altitude.

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这是一幅由美国地形勘测出来的地形图，基本上，所有海拔等高线在一块陆地上。

So, a topographic map, this one from the US geological survey shows you, basically, all the level curves of an altitude function on a piece of land.

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两坡三种生活型的TBA沿海拔梯度变化特征基本上相似。

TBA patterns of these three life forms along the altitudinal gradient were similar on both slopes.

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